C# 继承类 的事件问题

C# code

        static void Main(string[] args)        {            B b = new B();            b.OnTestEvent +=new TestHandler(delegate                {                    Console.WriteLine("执行了事件");                   });            new B().Test();            Console.Read();        }        public class B : A        {            public void Test()            {                Demo();                OnTestEvent();// 这里报错            }        }        public class A : IA        {            public void Demo()            {                Console.WriteLine("Class A demo");                          }            public event TestHandler OnTestEvent;        }        public delegate void TestHandler();        public interface IA        {            void Demo();            event TestHandler OnTestEvent;        }

我想要的是，A类继承接口IA，B类继承A类，
想在B类中某时刻触发事件OnTest()，然后向外通知。

[解决办法]

C# code

      public class B : A      {          public void Test()          {              Demo();              DoTest();          }      }      public class A : IA      {          public void Demo()          {              Console.WriteLine("Class A demo");          }          protected void DoTest()          {              if (OnTestEvent != null)              {                  OnTestEvent();// 这里报错              }          }          public event TestHandler OnTestEvent;      }
[解决办法]
C# code
    class Program    {        static void Main(string[] args)        {            B b = new B();            b.TestEvent += new TestHandler(delegate            {                Console.WriteLine("执行了事件");            });            //new B().Test();            b.Test();            Console.Read();        }        public class B : A        {            public void Test()            {                Demo();                OnTestEvent();// 这里报错            }        }        public class A : IA        {            public void Demo()            {                Console.WriteLine("Class A demo");            }            public event TestHandler TestEvent;            protected virtual void OnTestEvent()            {                if (TestEvent != null)                {                    TestEvent();                }            }        }        public delegate void TestHandler();        public interface IA        {            void Demo();            event TestHandler TestEvent;        }            }
[解决办法]
L1正解，我的想法也是一样的
[解决办法]
正解 你干嘛再new一个B出来？
探讨

C# code

    class Program
    {
        static void Main(string[] args)
        {
            B b = new B();
            b.TestEvent += new TestHandler(delegate
            {
               ……